如何動態地創建循環

Question

一個2D的NSMutableArray我製作的原創帖子here

起初，我試圖填補一個CGPoint ** allPaths。

第一個維度是「一條路徑」，第二個維度是「航點」。我從中得到一個CGPoint。

例如：allPaths [0] [2]會給我第一個路徑，第三個航點的CGPoint。

我成功地用簡單的C做了令人討厭的循環。現在我正試圖在Obj-C和NSMutableArrays中做同樣的事情。

這裏是我的代碼：

CCTMXObjectGroup *path; 
NSMutableDictionary *waypoint; 

int pathCounter = 0; 
int waypointCounter = 0; 

NSMutableArray *allPaths = [[NSMutableArray alloc] init]; 
NSMutableArray *allWaypointsForAPath = [[NSMutableArray alloc] init]; 

//Get all the Paths 
while ((path = [self.tileMap objectGroupNamed:[NSString stringWithFormat:@"Path%d", pathCounter]])) 
{ 
    waypointCounter = 0; 
    //Empty all the data of the waypoints (so I can reuse it) 
    [allWaypointsForAPath removeAllObjects]; 

    //Get all the waypoints from the path 
    while ((waypoint = [path objectNamed:[NSString stringWithFormat:@"Wpt%d", waypointCounter]])) 
    { 
     int x = [[waypoint valueForKey:@"x"] intValue]; 
     int y = [[waypoint valueForKey:@"y"] intValue]; 

     [allWaypointsForAPath addObject:[NSValue valueWithCGPoint:CGPointMake(x, y)]]; 
     //Get to the next waypoint 
     waypointCounter++; 
    } 

    //Add the waypoints of the path to the list of paths 
    [allPaths addObject:allWaypointsForAPath]; 

    //Get to the next path 
    pathCounter++; 
} 

我實際的問題是，在allPaths所有路徑都等於最後一個。 （所有的第一個路徑被最後一個覆蓋）

我知道這是因爲這一行[allPaths addObject：allWaypointsForAPath]。

然而，我該怎麼做呢？

Answer 1

哦，我想我找到了一些東西！ 不確定內存問題，但我猜垃圾回收器應該工作？

其實，我只是declaremy的NSMutableArray * allWaypointsForAPath在這樣的循環：

int pathCounter = 0; 
int waypointCounter = 0; 

NSMutableArray *allPaths = [[NSMutableArray alloc] init]; 

//Get all the PathZ 
while ((path = [self.tileMap objectGroupNamed:[NSString stringWithFormat:@"Path%d", pathCounter]])) 
{ 
    waypointCounter = 0; 
    NSMutableArray *allWaypointsForAPath = [[NSMutableArray alloc] init]; 
    //Get all the waypoints from the path 
    while ((waypoint = [path objectNamed:[NSString stringWithFormat:@"Wpt%d", waypointCounter]])) 
    { 
     int x = [[waypoint valueForKey:@"x"] intValue]; 
     int y = [[waypoint valueForKey:@"y"] intValue]; 
     [allWaypointsForAPath addObject:[NSValue valueWithCGPoint:CGPointMake(x, y)]]; 
     //Get to the next waypoint 
     waypointCounter++; 
    } 

    [allPaths addObject:allWaypointsForAPath]; 
    //Get to the next path 
    pathCounter++; 
}